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A rare uterine cancer with characteristics of a usually intracavitary friable relatively well-circumscribed neoplasm located in the corpus uteri with possible infiltration of the myometrium. The neoplasm is composed microscopically of cells resembling urothelial transition cells with a papillary or polypoid growth pattern, typically with another type of carcinoma (frequently endometrial adenocarcinoma), generally manifesting with postmenopausal vaginal bleeding.
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